Autogenous cutting burner



H. W. C. SCHRDER AUToGENoUs CUTTING BURNER F1104 April. 4. 1925 Patented Jal-n3, 1928. i

UNITED STATES y v1,654,557 PATENT OFFICE.v

HANS WILHELM CHRISTIAN s'cIrRiiER, or LBECK,` GERMANY, ASSIGNOR ro ALEX- ANDER BERNHARD DRGER, or FINKENBERG, LUBEcx, GERMANY.

AUTOGENOUS CUTTING BURNER.

Application led April 4, 1925, Serial No. 20,868, and in Germany April 16, 1924.

In some cutting work it is desirable or necessary that the cutting oxygen shall be turned on and olf by the hand holding the burner, because the other hand of the person using the burner is occupied either for holding the material or for clinging to a framework or the like.

One hand cutting burners are already known in which the sliding movement of a u valve Stem for turning on or off the cutting oxygen is produced by the aid of a double y thumb piece mounted ona shaft and operated by the hand grasping the handle the burner.

One hand cutting burners are also known in which the valve stem is projecting outwards through a stufling box inthe valve casing or chest. The disadvantage of this arrangement is that it is difficult of access. 23 A good grip must however be maintained in freehanded cutting during the guiding of the burner and for this reason the cutting oxygen valve must be capable of being opened and closed by light pressure. Otherwise a jerk is produced whereby the ame or` the cutting jet is deflected and the work rendered faulty. p i |llhe disadvantages herein mentioned are overcome b the present invention which 3U. is characterlzed by the fact that the valve stem is guided loosely without any lateral packing in a Sleeve in the valve casing or chest andvat one ter'minal or extreme position packs the valve seat and at the other l terminal or extreme position packs the valve casing or chest against the outside.

Other objects of the invention are a valvev i actuating mechanism providing for an easy manual operation of the valve-,1 and a spring aolactuated mechanism preventing the valve from staying4 in an intermediate position when it is relieved from the pressure exerted by -the'controlling hand, but keeping 1 ',Ithe valve in the one extreme position against lthe action of said spring.

5 -The drawing Shows by way of, example a gonstructional form of thehandle portion of 'al cutting burner with means for turning the oXygenon and olf by the pressureof the Figure 1 is a side elevation,

Figure 2 is a top plan view, Figure 3 is a View from the hose Slide with I 'the oxygen valve open, l #Si Figure 4 is the same view with the oxygen valve closed and Figure 5 is 'a transverse Section of the open oxygen valve on a larger scale taken approximately on the line 5-5 of Fig. l.

The three principal parts of the apparatus are 'the valve Stem a (see Figure 5) the bent lever b and the eccentric or cam `0. The Stem ais adapted to move easily to and fro inthe guide Sleeve d. At one terminalL or extreme position it closes the valve seat e and at the other terminal or extremeposition it bears, when the valve is wide open against the rubber disc or washer'f3 on the one hand by the force of the light spring g and on the other hand bythe pressure of the gas as it flows in. An intermediate po-I sition is not-needed and consequently it is unnecessary to pack the stem astight in a stuffing box or provide a gastig t connection with a diaphragm. 'The movement from shut to open and vice versa takes place so quickly that there can be no question of any-V loss of oxygen provided that the valve is prevented from staying in an intermediate position between shut andl open, In accordance with the small cross sectional `area of the stem and the Slight amount of friction Whichexists the force required to close the valve is very small. By the yaid of the toggle lever b which moves around the rotating bolt h and the use of thev eccentric c it is possible to convert the linear movement ofthe Stern a into a. rotary motion and then to bring the` shaft i' with the thumb pieces la, k1 (see Figures 1 to 4) into a convenient position for the'hand.

` When the handle m of the burner is rasped in the hand the thumb canbe moved reely., The function of the thumb is to depress the'left hand side c of the thumb piece to open the valve and the` right hand Side thereof to close it, while theeccentr'ic o on the one hand releases the togglelever b with the pressure screw n which acts on `the valve bolt and on the other hand rocks'the toggle 10Q lever b back into the closing positionso as to close the valve stem by means of the pressure screw n. l

If the operator Should inadvertently release the thumb piece in` a position iii-which 105 the yalv'e assumes an intermediate position and, consequently,` a leakage' through the guide sleeve d e ists, the spring g will move the valve a int the losing-position shown in Fig.' 5. The 'camk a is so Shaped that *it 1.10

does not resist the action ofthe spring in such an intermediate position. Vhen the valve is, however, `entirely opened, the cam 'c locks the lever b against the action of the spring g and the valve will, therefore, stay in the open position after the thumb piece has been released by the operator.

In order to still further reduce the friction of the eccentric on .the toggle lever it may be provided with an anti-friction ring. Instead of makingthe thumb piece of the form shown it may also be so constructed that one or both sides. are bent atan angle and lie over the handle so that the ball of the hand can be used for operating the valve.

Having `now particularly described and ascertained the nature of my said invention and in what mannei the same vis to be per-` formed, I declare that what I claim is:

1*. A 'one hand loperated cutting burner comprising a valve casing provided with avalve seat and With a 'bore in axial registry therewith, a stem passing loosely through saidaxial bore, a valve Within said casing, .Carried by said stem and resting in an extreme inner position against said seat and4 resting in an extreme outer position against the inner mouth of said bore thereby sealing the same, a spring tending to move saidvvalve into the one of said extreme positions, and a valve actuating mechanism comprising a pivoted cam and lever to lock said valve against the action of said spring in the other cxtreme position only, thereby permitting the valve to be controlled by the influence 0f the spring in all other positions thereof.

2. A one hand operated cutting burner comprising a valve casing provided with a valve seat and with a bore in axial registry therewith, a stein paf-'sing loosely through said axial bore, a valve Within said casing, carried by said stem and resting in an extreme inner 'position againstsaid seat and resting in .an extreme outer position against the inner mouth of said bore thereby 'sealing the same, a handle to support the burner, a movable thumb piece located in proximity to 'said handle, a connection between said valve and said thumb piece, and a spring asSoc1ated with sai-d valve to force the saine into the one extreme position, said connection comprising .a pivoted cam and lever locking said valve against the action of said springv in the other extreme position but otherwise permitting said spring to move said valve.

HANS WILHELM CHRISTIAN SCHRDER. 

